New posts in Discrete Mathematics

The union of two simple planar graph have chromatic number $\leq 12$

Four-letter word contains no two consecutive equal letters.

Two cowboys A and B decide to solve a dispute with a duel.

A problem in discrete optimization

Probability problem from CMU contest prep course

Proof: not a perfect square

An interesting problem with "decomposing" natural numbers.

Bagel probability intuition; unordered vs ordered selection

Prove existence of non-computable double argument function

Find all functions $f:\mathbb N_0\to \mathbb N_0$ such that $f(a^2+b^2)=f(a)^2+f(b)^2$